minirst: reindent _admonitiontitles I don't like the verical indent. While I was here, I cleaned up some whitespace and added a trailing comma on the last element.

tags: extract filenode filtering into its own function We'll also need to reuse this logic so we extract it into its own function. We document some of the logic in the process.

tags: extract tags computation from fnodes into its own function I'm about to introduce code that needs to perform such computation on "arbitrary" nodes. The logic is extracted into its own function for reuse.